Daytronic Corporation - AC "SEM" Sealed LVDT Series

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AC-Operated, Short-Stroke
Spring-Extended Armature

"SEM" Sealed LVDT Series (AC)

Designed for use while submerged under fresh water and most other non-corrosive liquids and gases, these LVDT's are extensively used in industrial and R&D applications.

The stainless-steel body is hermetically sealed and has a cable exit which is double-sealed using an internal rubber gland plus a polyolefin shrink tube covering the cable and transducer body. An alternative MI stainless-steel sheathed cable option is available for use under high liquid pressures (as in soil testing apparatus, hydraulics, vessel studies, etc.)

General Specifications are given below.

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AC "SEM" Series

Dimension "X" is at the Electrical Zero Position

LVDT Model	Nom. Linear Range (in. / mm)	Dimensions (in. / mm)			Max. Spring Force (oz. / g)	Nom. Sensitivity (V/V at f.s.)
LVDT Model	Nom. Linear Range (in. / mm)	"L"	"X"	"D"	Max. Spring Force (oz. / g)	Nom. Sensitivity (V/V at f.s.)
DS80SEM	�0.04 �1	2.28 58	0.45 11.5	0.315 8	5.3 150	0.07
DS200SEM	�0.1 �2.5	2.60 66	0.49 12.5	0.374 9.5	4.2 120	0.19
DS400SEM	�0.2 �5	2.86 72.6	0.54 13.7	0.374 9.5	4.6 130	0.36
DS600SEM	�0.3 �7.5	3.75 95.3	0.60 15.25	0.374 9.5	8.6 245	0.42
DS800SEM	�0.4 �10	4.21 106.5	0.75 19	0.374 9.5	7.4 210	0.58
DS1000SEM	�0.5 �12.5	5.08 129	0.85 21.6	0.374 9.5	7.5 215	0.78

General AC "SEM" Specifications [Top

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(See also the statement on LVDT specifications)

Supply Requirements	0.5 VAC to 7 VAC (RMS), 2 to 10 kHz sinusoidal
Calibrated Supply (Excitation)	5 VAC (RMS) at 5 kHz sinusoidal, 30 mA
Armature	SPRING-EXTENDED
Linearity (% error of full scale, worst case)	�0.5%*
Phase Shift	Typically 10� at 5-VAC, 5-kHz excitation
Output Load (optimum)	100 kΩ
Temperature Coefficient (Zero and Span)	�0.01% of full scale/�C (�0.005% of full scale/�F)
Operating Temperature Range	-20� C to +125� C (-4� F to +257� F)
Operating Pressure	500 psi (sealed onto cable outer sleeve)
Electrical Termination	6.5 ft. (2 m) shielded cable
* �0.25% and �0.1% linearity are optional on some models (contact the factory for details).

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